Fanciful means imaginative rather than founded on fact. A fanciful theory, a fanciful explanation, fanciful nonsense.
It is a polite dismissal: calling an idea fanciful says it is charming and wrong. In design it is neutral or admiring, and a fanciful building is one with more decoration than any purpose required.
1adjectivefancifulImaginative rather than founded on fact.
“His fanciful story about being raised by wolves fooled no one.”
fanciful is a quality.
Fancy plus -ful. Fancy is a contraction of fantasy, from Greek phantasia, imagination.
Proto-Indo-European
*bʰeh₂- (shine)
Proto-Indo-European
*bʰh₂nyéti
Ancient Greek
φαντασία
Latin
phantasia — an idea, notion, fancy, phantasm
Medieval Latin
fantasia
Old French
fantasie
Middle English
fansy
English
fancy
English, today
fanciful
Built from
From fancy + ful. fancy comes from Middle English fansy, fantsy, a contraction of fantasy, fantasye, fantasie, from Old French fantasie, from Medieval Latin fantasia, from Latin phantasia (“an idea, notion, fancy, phantasm”), from Ancient Greek φαντασία, from φαντάζω (“to render visible”), from φαντός (“visible”), from φαίνω (“to make visible”); from the same root as φάος (“light”); ultimately from Proto-Indo-European bʰh₂nyéti, from the root bʰeh₂- (“to shine”). a doublet of fantasia and fantasy and phantasia and phantasy.
Etymology from Wiktionary, CC BY-SA